CN101432335B - Light guide member and illumination unit - Google Patents

Light guide member and illumination unit Download PDF

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Publication number
CN101432335B
CN101432335B CN2007800151809A CN200780015180A CN101432335B CN 101432335 B CN101432335 B CN 101432335B CN 2007800151809 A CN2007800151809 A CN 2007800151809A CN 200780015180 A CN200780015180 A CN 200780015180A CN 101432335 B CN101432335 B CN 101432335B
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light
conducting member
repeating unit
guiding plate
formula
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CN101432335A (en
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石川康弘
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C08G64/16—Aliphatic-aromatic or araliphatic polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C08G64/04—Aromatic polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12035—Materials
    • G02B2006/12069—Organic material

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)

Abstract

The present invention provides a light guide member comprising a polycarbonate copolymer having a repeating unit represented by the following formula and formula (II), which is thin in shape and free from deterioration in performance due to thermal deterioration (yellowing) or gas generation, such as a light guide plate comprising a polycarbonate resin, and a lighting unit using the same.

Description

Light conducting member and lighting unit
Technical field
The present invention relates to light conducting member and lighting unit.Relate to the light conducting member of the light guiding plate that obtains with the Copolycarbonate with specific structure etc. and the lighting unit that possesses this light guide member and light source in more detail.
Background technology
Light guiding plate is one of the employed optical component of the backlight unit of various display unit.The material of 1～7 inch so small-sized light guiding plate uses the polycarbonate resin of being made by dihydroxyphenyl propane.The polycarbonate resin of making by dihydroxyphenyl propane (below, abbreviate PC as) from the aspect of the good transparency, thermotolerance, agent of low hygroscopicity, mechanical characteristics, be suitable for carrying on the light guiding plate of mobile phone, mobile game machine, navigationsystem etc. (for example, referring to Patent Document 1).
Also have, known a kind of good optical polycarbonate of resistance to reflow soldering (reflow solering) as its purposes, proposes to be used for light guiding plate (for example, referring to Patent Document 2).,, light guiding plate is shaped, then, is difficult to light guiding plate thinning as purpose because flowability is low by injection molding forming if will use the PC composition of patent documentation 1 or patent documentation 2 records.
On the other hand, in recent years, wished slimming, miniaturization, made also attenuation and save the space of light guiding plate self by the light source that will be used for the illuminated backlight of end face.
Also known a kind of by α, α '-two (4-hydroxy phenyl)-diisopropyl benzene and 2, the multipolymer (for example, referring to Patent Document 3) that 2-two (4-hydroxy phenyl) propane (dihydroxyphenyl propane) constitutes.
Known this multipolymer considers that from low suction, low double refraction aspect the purposes of this multipolymer is as optical lens (for example, referring to Patent Document 4 and 5), optic disc base board (for example, referring to Patent Document 6).Also be not used for the light guiding plate purposes.
The PC that use is made by dihydroxyphenyl propane is during as the light guiding plate material, for slimming, cylinder temperature in the time of must be with injection molding forming is provided with very highly, perhaps be provided with injection-molded speed very fast, but this moment, have a little yellow or generation gas etc. because the temperature by resin or shear is burnt the tone of the light guiding plate that (せ ん break baked け) obtain, be difficult to be met the light guiding plate of performance.
When using acrylic resin (below, abbreviate PMMA as), because undercapacity, produce the problem that is shaped or occurs crackle during assembling as the light guiding plate resin again.
Again, even PMMA can be shaped, but because also can there be the problem that hygroscopic deformation takes place in the water absorbability height.
Like this, seeking the light conducting member of a kind of light guiding plate that constitutes by polycarbonate resin material that can overcome above-mentioned problem, more slimming etc.
Patent documentation 1: Japanese patent laid-open 11-158364 number
Patent documentation 2: the Japanese Patent spy opens 2005-60628 number
Patent documentation 3: the Japanese Patent spy opens clear 63-89539 number
Patent documentation 4: the Japanese Patent spy opens 2003-192780 number
Patent documentation 5: the Japanese Patent spy opens 2003-96179 number
Patent documentation 6: the Japanese Patent spy opens 2002-348367 number
Summary of the invention
The present invention invents for the problem that solves above-mentioned conventional art, especially be to provide a kind of thin form, can not be owing to thermal degradation when (xanthochromia), produce that gas causes degradation, the optical material of the light guiding plate that constitutes by the polycarbonate based material etc., and use the lighting unit of this optical material.
The inventor carries out conscientious research and reaches above-mentioned purpose, found that if use Copolycarbonate with specific repeating unit as the light guide member of light guiding plate etc., can obtain the light conducting member of a kind of thin light guiding plate etc. with sufficient intensity, the light conducting member transparency of this light guiding plate etc. is good, low water absorbable, high refractive index, low double refraction, the xanthochromia that does not have the thermal degradation when owing to resin to cause, tone is good.
That is, the invention provides:
(1) a kind of light conducting member uses the Copolycarbonate of the repeating unit with following formula (I) and following formula (II) expression to obtain,
Change 1
(2) as above-mentioned (1) described light conducting member, the reduced viscosity of Copolycarbonate is 30～70.
(3) as above-mentioned (1) or (2) described light conducting member, the molar ratio of the repeating unit of the repeating unit of above-mentioned formula (I) expression and above-mentioned formula (II) expression is 1:99～50:50.
(4) as each the described light conducting member in above-mentioned (1)～(3), light conducting member is a light guiding plate.
(5) a kind of lighting unit possesses each described light conducting member in above-mentioned (1)～(4) and light source and constitutes.
Embodiment
Copolycarbonate
The employed Copolycarbonate of light conducting member of the present invention is the multipolymer with repeating unit of following formula (I) and following formula (II) expression, and the manufacture method that can adopt habitual manufacture method, promptly is called as interfacial polymerization or ester-interchange method is made.
Change 2
Figure G2007800151809D00031
For example, in the solvent of methylene dichloride etc., in the presence of known acid acceptor, can be by making the α of polycarbonate oligomer and following formula (IV) expression, α '-two (4-hydroxy phenyl)-diisopropyl benzene (below, be called bis-phenol M) react, the polymeric interfacial polymerization is made, perhaps can pass through by the such carbonic ether presoma of diphenyl carbonate, dihydroxyphenyl propane and bis-phenol M carry out polymerization process of transesterification reaction etc. and make, above-mentioned polycarbonate oligomer is by 2 of formula (III) expression, the carbonic ether presoma of 2-two (4-hydroxy phenyl) propane (below, be called dihydroxyphenyl propane) and carbonyl chloride etc. reacts and obtains.
Change 3
Change 4
Figure G2007800151809D00041
The mol ratio of the repeating unit of the repeating unit of formula (I) and formula (II)
In the used Copolycarbonate of light conducting member of the present invention, the molar ratio of the repeating unit of the repeating unit of formula (I) and formula (II) it is desirable to 1:99～50:50, it is desirable to 1:99～30:70 especially.
In Copolycarbonate, the molar ratio of the repeating unit of the repeating unit of formula (I) and formula (II) is if in the scope of 1:99～50:50, but then can satisfy the flowability of mechanical properties and slimming, can be configured as thin or large-scale light guiding plate well.
Therefore, during the Copolycarbonate polymerization,, the mol ratio of repeating unit is separately got final product in above-mentioned scope as long as make bis-phenol M and dihydroxyphenyl propane carry out copolyreaction.
During the Copolycarbonate polymerization, can import the repeating unit except that the repeating unit of above-mentioned general formula (I) and general formula (II) expression again.Specifically can import the repeating unit of the expression of following formula V～(VII).
Change 5
Figure G2007800151809D00042
(N is 1～60 number.)
Change 6
Figure G2007800151809D00043
Change 7
Figure G2007800151809D00051
(R is the alkyl of H or carbonatoms 1～12.)
Change 8
Figure G2007800151809D00052
Can in the repeating unit of above-mentioned formula (I) and formula (II) expression, import separately or combination imports above-mentioned general formula or formula V～(VII) more than 2 kinds repeating unit.With logical formula V (gather), the silicone compounds residue was as repeating unit the time, add resistance to crocking and wear resistant, importing is from 4 of formula (VI), during the repeating unit of 4 '-dihydroxybiphenyl, the raising flame retardancy.Also have, import general formula (VII) expression have the repeating unit of diamantane skeleton the time, improve thermotolerance.Importing can improve thermotolerance during from the repeating unit of two (4-hydroxy phenyl) ditan of formula (VIII) expression.
The carbonyl source
As the carbonyl source of the used polycarbonate of the present invention, except using the general carbonyl chloride that in the interfacial polycondensation of polycarbonate, uses, can also use three carbonyl chlorides, bromine carbonyl chloride etc.In addition, ester-interchange method can use carbonic acid diallyl etc., and the carbonylation method of oxidation can use carbon monoxide etc.
Terminal terminator
As the terminal terminator of the used Copolycarbonate of light conducting member of the present invention, can use the various terminal terminator that is generally used for polycarbonate polymerization.Generally can use the monobasic phenol.As monobasic phenol, has the phenol of aromatics on (long-chain) alkyl, aliphatic poly ester group and the substituting group of use phenol, straight chain or branch-like.
Particularly, have for example phenol, neighbour,, p-cresol, p-tert-butylphenol, Pentaphen, to tert-octyl phenol, to cumylphenol, p methoxy phenol, p-phenyl phenol, isooctyl phenol, adjacent, or contraposition have monoalkyl phenol, 9-(4-hydroxy phenyl)-9-(p-methoxy-phenyl) fluorenes, 9-(4-hydroxy-3-methyl phenyl)-9-(4-hydroxy-3-methyl phenyl)-9-(4-methoxyl group-3-aminomethyl phenyl) fluorenes and 4-(1-adamantyl) phenol etc. of alkyl of the straight or branched of average carbon atom number 12～35.Wherein it is desirable to p-tert-butylphenol, to cumylphenol, to tert-octyl phenol, phenol.
Branching agent
In the present invention, as branching agent, for example also can use and have 1 more than 3,1,1-three (4-hydroxy phenyl) ethane, 4,4 '-[1-[4-[1-(hydroxy phenyl)-1-methylethyl] phenyl] ethylidene] bis-phenol, α, α, α three (4-hydroxy phenyl)-1,3,5-triisopropylbenzene, 1-[Alpha-Methyl-α-(4 '-hydroxy phenyl) ethyl]-4-[α ', α '-two (4 "-hydroxy phenyl) ethyl] compound of functional group of benzene, Phloroglucinol (7 ロ ロ グ リ シ Application), trimellitic acid, isatin two (ortho-cresol) etc.
The reduced viscosity of Copolycarbonate
It is desirable to, the reduced viscosity of the Copolycarbonate that light conducting member of the present invention is used is 30～70, and promptly being converted into viscosity-average molecular weight (Mv) is 10,000～28,000.As if reduced viscosity is 30～70, but then can satisfy the flowability of mechanical properties and slimming, can be configured as large-scale light guiding plate etc. well.
Reduced viscosity is the value of measuring according to ISO1628-4 (1999).
Various additives
Also can under the degree of not damaging performance, add various additives in the used Copolycarbonate of the present invention.As additive, antioxidant, benzotriazole system, benzo benzophenone, malonic ester system, the oxalyl that steric hindrance phenol system, ester system, phosphoric acid ester system, amine system etc. are for example arranged for example is for the internal lubricant of the photostabilizer of the UV light absorber of aniline system etc., bulky amine system etc., aliphatic carboxylic acid esters, system, paraffin, silicone oil, polyethylene wax etc., fire-retardantization agent commonly used, flame retardant, tinting material, antistatic agent, anti, releasing agent, lubrication prescription etc.
In order to make light conducting member of the present invention, at first make the molding material that comprises this Copolycarbonate.Adopt known method, for example use ribbon blender, rotary drum, Henschel mixer, Banbury, single shaft screw extrusion press, double-screw extrusion machine, kneading extrusion machine, multiaxis screw extrusion press etc., this Copolycarbonate and the above-mentioned various additives that use according to expectation are carried out melting mixing, can make this molding material.Heating temperature when mixing is normally suitable to be 250～320 ℃.
Can by for example about 240～400 ℃ of cylinder temperature, it is desirable under the condition of about 60～130 ℃ of 280～380 ℃, metal die temperature, the shaped material of such making is carried out injection molding forming, make light conducting member of the present invention.
As light conducting member of the present invention, can have the light conducting member of shape such as tabular, bar-shaped, spherical for example, it is desirable to tabular light guiding plate but wherein can enumerate.By using LED as light source, make light conducting member leaded light of the present invention, can constitute tabular, bar-shaped, spherical etc. lighting unit.Illumination, design part that this lighting unit can be suitable in the backlight, vehicle, framework, indoor setting as liquid crystal indicator use.
Light guiding plate
Size, shape for the light guiding plate in the light conducting member of the present invention do not limit especially, are configured as flat board about thickness 0.1～3mm, curved slab etc. and get final product.Just, shape may not be flat, can be the curved slab with lens effect, can be suitably selected according to purpose, purposes.For example, also can be to have more away from the thickness of the light source light guiding plate structure of the section of the wedge type shape of attenuation more gradually.Also can make the preceding structure that the display part that will be made of other member is arranged on planar twinkler integratedly.
When light guiding plate is shaped owing to use pressing mold to form light scattering layer, so by on the surface of plate or the one or both sides at the back side carry out microprism and duplicate, can obtain the planar twinkler of homogeneous.
Above-mentioned microprism is had no particular limits, but it is desirable to V groove shape, contrary V convex, hemispheric microprism.Again, it highly it is desirable to 10～300 μ m, and that better is 20～200 μ m, it is desirable to 50～100 μ m especially.
In addition, in order to form described light scattering layer, also can carry out dot pattern printing, the perhaps cutting of circular cone drill bit.
The present invention can also provide the lighting unit that possesses described light conducting member of the present invention and light source and constitute.
For example, at the heavy section configuration light source of the light guiding plate of wedge shape, constitute the lighting unit that the surface light source unit by the end-surface type of LCD TV, computer, indicating meter etc. constitutes.As light source,, can also use self twinkler of cold-cathode tube, LED, other organic EL etc. except luminescent lamp.When liquid crystal indicator adopts lighting unit of the present invention, can adopt in mode backlight or the preceding smooth mode any.
According to the present invention, by the Copolycarbonate that use has specific structure, can provide a kind of does not have because the xanthochromia that the thermal degradation when of resin causes, tone is good and have the light conducting member of the thin light guiding plate etc. of enough intensity.Again, light conducting member and combination of light sources by with light guiding plate of the present invention etc. can constitute thin lighting unit, by using this lighting unit, can make liquid crystal indicator etc. reach slimming.
Embodiment
Below, the present invention will be described in more detail by embodiment, but the present invention is not subjected to any qualification because of these examples.
Production Example 1
The synthesis procedure of oligopolymer
Toward the aqueous sodium hydroxide solution of 5.6 quality % add with respect to after dissolved dihydroxyphenyl propane (the following BP that abbreviates as sometimes) be the V-Brite B of 2000ppm, dissolve BPA therein, make that BPA concentration is 13.5 quality %, prepare the aqueous sodium hydroxide solution of BPA.
In the tube-type reactor of internal diameter 6mm, pipe range 30m continuously with 40L (liter)/hour flow feed the aqueous sodium hydroxide solution of this BPA, feed methylene dichloride, feed carbonyl chloride with 15L/ hour flow with 4.0kg/ hour flow.
Here the tube-type reactor of Shi Yonging has the sleeve portion of dual pipe, feeds water coolant at sleeve portion, and the outflow temperature of reaction solution is remained on below 40 ℃.
To import the tank reactor of the band baffle plate that possesses the internal volume 40L that retreats the wing from the reaction solution that tube-type reactor comes out continuously, again inward with 2.8L/ hour speed add BPA aqueous sodium hydroxide solution, add 25 quality % aqueous sodium hydroxide solutions, add water, add 1 quality % triethylamine aqueous solution with 0.07L/ hour speed with 0.64L/ hour speed with 17L/ hour speed, react.Discharge continuously from the reaction solution that tank reactor overflows, leave standstill, separate and remove water, take the methylene dichloride phase.
The polycarbonate oligomer concentration that obtains like this is 320g/L, and the concentration of chloroformic acid ester group is 0.75mol/L.
Polymerization process
Toward possess barrier plate, oar type agitating vane and cooling methylene dichloride, 191g p-tert-butylphenol with the above-mentioned oligomer solution that adds 15L in the telescopic 50L tank reactor, 9.0L (below, abbreviate PTBP as), the triethylamine of 3.0ml, under agitation, adding bis-phenol M (below, sometimes abbreviate BPM as) potassium hydroxide solution (BPM of 973g is dissolved in to be dissolved in 520gKOH and 1.9g V-Brite B in the aqueous solution of 5.5L water), carry out the reaction 10 minutes of polycarbonate oligomer and bis-phenol M.
Add the aqueous sodium hydroxide solution (BPA of 513g is dissolved in to be dissolved in 306gNaOH and 1.0g V-Brite B in the aqueous solution of 4.5L water) of BPA in this polymer fluid, carried out polyreaction 50 minutes.
Add the methylene dichloride 10L that is used to dilute, after stirring 10 minutes, make the organic phase that contains polycarbonate and contain superfluous BPA and the aqueous phase separation of NaOH, the organic phase of emanating out.
Clean with the 0.03mol/LNaOH aqueous solution of 15vol%, 0.2mol/L hydrochloric acid dichloromethane solution successively the Copolycarbonate that obtains like this, then clean repeatedly with pure water, the specific conductivity of the aqueous phase after cleaning is below 0.01 μ S/m.
The dichloromethane solution of the polycarbonate that cleaning is obtained concentrates, pulverizes, and under decompression, 100 ℃ the thin slice that obtains is carried out drying.
What try to achieve by NMR is 12:88 from the repeating unit of BPM with mol ratio from the repeating unit of BPA.
In this polymkeric substance of 100 mass parts, add the phosphorous antioxidant (rising sun electrification society makes trade(brand)name ァ デ カ ス タ Block PEP36) of 0.05 mass parts,,, obtain particle A in 250 ℃ of following granulations of resin temperature by taking mouthful extrusion machine of 40mm Φ out of.
Production Example 2
Except the addition with the potassium hydroxide aqueous solution of bis-phenol M carries out following change, do not add the aqueous sodium hydroxide solution of dihydroxyphenyl propane, other obtain particle (B) similarly to Example 1.
What try to achieve by NMR is 22:78 from the repeating unit of bis-phenol M with mol ratio from the repeating unit of dihydroxyphenyl propane.
(potassium hydroxide aqueous solution of bis-phenol M)
The bis-phenol M of 1738g is dissolved in 957gKOH and 1.9g V-Brite B be dissolved in and forms in the aqueous solution of 5.5L water.
Production Example 3
Except the addition with PTBP changes into the 160g from 191g, other obtain particle (C) similarly to Example 2.
What try to achieve by NMR is 22:78 from the repeating unit of bis-phenol M with mol ratio from the repeating unit of dihydroxyphenyl propane.
Compare Production Example 1
(Idemitsu Kosen Co., Ltd. makes at the polycarbonate resin of the reduced viscosity 39.4 that only is made of BPA of 100 mass parts, タ 7 ロ Application FN1500) add the ァ デ カ ス タ Block PEP36 (trade(brand)name of 0.05 mass parts in, rising sun electrification society makes), by taking mouthful extrusion machine of (vent) 40mm Φ out of, in 250 ℃ of following granulations of resin temperature, obtain particle (D).Compare Production Example 2
(Idemitsu Kosen Co., Ltd. makes at the polycarbonate resin of the reduced viscosity 44.0 that only is made of BPA of 100 mass parts, タ 7 ロ Application FN1600) add the ァ デ カ ス タ Block PEP36 (trade(brand)name of 0.05 mass parts in, rising sun electrification society makes), by taking mouthful extrusion machine of 40mm Φ out of, in 250 ℃ of following granulations of resin temperature, obtain particle (E).
Embodiment 1～4 and comparative example 1～3
The particle (A)～(E) that uses above-mentioned Production Example and comparison Production Example to obtain carries out injection molding forming under the following conditions, is configured as light guiding plate.
Injection molding machine: Sumitomo heavy-duty machine tool industry (strain) is made, SG100M-HP
Light guiding plate shape: length 54mm, wide 39mm, thickness 0.30mm, 0.35mm or 0.50mm
Prism: V groove
Estimate
(1) reduced viscosity
Measure according to ISO1628-4 (1999).
(2) mensuration of colourity
Determinator: be formed on the area source of the end-surface type of bottom surface configuration reflectance coating, 4 LED of end configuration,, light guiding plate be configured to prism mould side below here, 2 of overlapping in order diffusion barrier, raising brightness films constitute planar luminous body.
Each LED is applied 3.25 volts voltage, make the bright lamp of LED with current value 10mA.(x is y) by trying to achieve apart from the measured value of anti-light inlet side 5mm with apart from the difference of the measured value of light inlet side 5mm for colour difference.It is little to it is desirable to this colour difference, and the colour difference in anti-light in part and the light in part is little.Use EyeScale3 to carry out the mensuration of colourity as YC mensuration machine.
The summarizing evaluation result is shown in the table 1.
As shown in table 1, from the result of the embodiment of polycarbonate-based resin composition of the present invention as can be seen, in injection molding forming, during than the aromatic series PC that only uses BPA to obtain, under mobile not bad, low cylinder temperature and the injection speed, also can be configured as thickness is the thin of 0.30mm.Again, colour difference is little, below 0.01, has high light guiding plate performance.Utilizability on the industry
According to the present invention, by the Copolycarbonate that use has specific structure, xanthochromia, the tone that can obtain not having the thermal degradation when of resin to cause is good and have a light conducting member of the thin light guiding plate etc. of enough intensity.
By with these light conducting members and combination of light sources, can constitute thin lighting unit, the illumination, the design part that are suitable in the backlight, vehicle, framework, indoor setting as liquid crystal indicator wait and utilize.
Figure G2007800151809D00111

Claims (4)

1. light conducting member, its Copolycarbonate with the repeating unit with the expression of following formula (I) and formula (II) obtains, and the repeating unit of above-mentioned formula (I) expression is 1: 99～50: 50 with the molar ratio of the repeating unit that formula (II) is represented.
Change 1
Figure FSB00000390497800011
Figure FSB00000390497800012
2. light conducting member as claimed in claim 1, the reduced viscosity of Copolycarbonate are 30～70.
3. light conducting member as claimed in claim 1 or 2, light conducting member is a light guiding plate.
4. lighting unit, it possesses each described light conducting member and light source in the claim 1～3.
CN2007800151809A 2006-04-28 2007-04-23 Light guide member and illumination unit Expired - Fee Related CN101432335B (en)

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JP2006126018A JP5030467B2 (en) 2006-04-28 2006-04-28 Light guide member and illumination unit
JP126018/2006 2006-04-28
PCT/JP2007/058719 WO2007125854A1 (en) 2006-04-28 2007-04-23 Light guide member and illumination unit

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CN101432335B true CN101432335B (en) 2011-05-25

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DE (1) DE112007001016T5 (en)
TW (1) TWI431038B (en)
WO (1) WO2007125854A1 (en)

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KR101252092B1 (en) * 2009-04-01 2013-04-12 엘지디스플레이 주식회사 Back light unit and liquid crystal display using the same
JP7106809B2 (en) * 2013-11-11 2022-07-27 出光興産株式会社 Aromatic polycarbonate resin molding

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